While playing my character lost his leg, but was lucky enough to get a cybernetic replacement, in a later fight he got hit by an orc choppa, it took his other leg but it also got me and GM thinking how to play it out if it got hit in a cybernetic one. I don't remember reading anything about it in the books (might have overlooked it). I brainstormed about it for a bit and came up with this solution.
The cybernetic limb (each) has it's own wound pool, those wounds can't be cured by medicae test (well duh!) but also do not impose any wounded status on the person hit, only the funcionality of the said limb, so even if the cyber arm gets shot off, the person is in no danger of bleeding out and does not suffer any additional penalties except for things that would require that arm (neural impulse suppresors kick in and you do not feel pain even tho it should be connected to your neural system somehow, to allow control, some crits might go over it as they overload the suppresor). Also, the craftmenship might influence the durability of said limb, as it is no longer a part of the orginal body, you do not use TB to determin the damage reduction (or whatever you use, seen many TB discussions here) but each cybernetics would have an unnatural toughnes, dependent on quality. UT so it can stack with armor worn over it.
Poor: 2 UT
Common: 4 UT
Good: 6 UT
Best: 8-9 UT
Also, the crit chart is a work in progress, will post it as I complete it.
Thoughts, ideas and constructive critisism welcome.